@Needleman 

A few things to try:

• Be sure you are using the power adapter that came with the router.
• Check for a firmware update.
• Test without any USB devices attached.
• Test with only one Ethernet device and in different ports.
• Power off the modem, router, Ethernet devices and USB devices. Power up the modem, wait fot to stabilize, then the router, wait for it to stabilize, then the Ethernet devices, then any USB devices.  
• Try different Ethernet cables
• Be sure the Ethernet, ISP cable, and power cables are not close and running parallel to each other for any long distance.
• Bypass the router and connect a PC direct to the modem to ensure it is not a ISP or modem issue.

Thanks, I will try those. I did get a different cat6 cable to supply, and am using different outlet with original power supply.

@Needleman 

@ArcherC8 

I have seen better performance with the above mentioned power and line changes (just 2 days so far).

However both my AX10 also have the issue that others have mentioned and independent testing experienced: 2.4 radio is not detectable. Both in tether say they are  sending but I can often not find them and as my security system is tied into that 2.4 wifi, it is a problem. Is there another firmware i can use? I remember someone mentioning a eurpean version? 

Also where can I change duplex/negotiation speed if I need to? That has been a big problem with other tpl eouters. (C7, C7, C2300). They seem not to have a setting for that or I just cannot find them. Sorry for the lengthy message. Thanks.